Radio plural program receiving system



July 24, 1934. M. w. ASKIN RADIO PLURAL PROGRAM RECEIVING SYSTEM FiledJuly 5, 1929 3 Sheets-Sheet l J6 INVEN TOR. 97% 4/1 W Examim' July 24,1934. M. W. ASKIN 1,967,213

RADIO PLURAL PROGRAM RECEIVING SYSTEM Filed July 5, 1929 3-She ets-Sheet2 Examim' L Q 7 INVENTOR.

' g uu q Examm y 24, 1934- M. w. ASKIN 1,967,218

RADIO PLURAL PROGRAM RECEIVING SYSTEM K G v g m G w i I Q Q m 1 INVENTOR.

Patented July 24, 1934 UNITED STATES Exami'm PATENT CFFICE RADIO PLURALPROGRAM RECEIVING SYSTEM Morris W. Askin, Washington, D. ApplicationJuly 5, 1929, Serial No. 376,252

19 Claims.

This invention relates to wireless receiving apparatus and has especialreference to a combination wireless receiving set.

In the reception of wireless waves, especially such as are used in theart of wireless telephony,

it is frequently desirable to receive waves of different frequencies atthe same time. For instance, a hotel wired for the transmission ofbroadcast programs to its various rooms may desire to afford its gueststhe choice of two pro grams.

One important object of the present invention is the provision of noveland improved receiving apparatus for wireless waves whereby two programsof different wave frequencies may be received over a single antenna.

Also, there are times when it is desirable to have ample volume in thereproduced sounds.

A second important object of this invention is to provide, in apparatusof this class, means whereby the receiving apparatus may be quicklychanged from apparatus receiving two sets of waves of differentfrequencies to apparatus having greatly increased amplifying power forwaves of any selected frequency.

A third important object of the invention is to provide a double set ofwireless apparatus in which the two sets may be used individually ortogether.

A fourth important object of the invention is to provide a novel andimproved arrangement of two sets of receiving apparatus of this classwherein the sets may be used individually or may be coupled by a simpleswitch arrangement either to bring the radio frequency amplifyingelements of the two sets in series to increase the amplificationreaching the detector or to bring the two audio frequency portions ofthe sets in multiple so as to substantially double the current strengthreaching the loud speaker.

A fifth important object of the invention is to so arrange the two setsor units that one of the two may be bought by a user at one time and theother set or unit may be bought at some future time and either readilycoupled to the first set or unit to produce the double set results ofselective coupling or used alone.

Another object of this invention is to provide means so that when acompany of men in military service having radio communication with amain commanding post out of the range of such communication, they maycouple their radio with a radio of another company of men so thatSignals can be obtained from a longer distance.

And a still further object is to have a radio receiving outfit wherebyone section of the radio is to receive sound and the other section ofthe total radio is to receive radio vision. Wires for the radio visionapparatus connected thereto make a combined television receiver capableof receiving two distinctive wave lengths for each purpose of the sameinstant.

A still further application of my invention is to superheterodynereceiving sets wherein the switching and circuit system which I providewill greatly increase the usefulness of such a receiving set. Anyreceiving system is applicable to the spirit of my invention, whetheroperated, by antenna, or by loop, or by two loops, or by antenna andloop, to receive the plural program which I describe.

This invention contemplates the association of radio receivers asexplained hereinafter, whether they be battery operated or connecteddirectly to the electric lines, whatever the type of circuit employed inthe receiver and irrespective of thetype of radio tube employed. It alsocontemplates the association of radio receivers for the reception of anytype of signal, (audible or visual) and of any frequency (long and shortwave). It is the purpose of this invention to combine a plural number ofreceivers, each of which may be used independently of the others forindependent purposes, into one receiver to provide either combinedaudible and visual entertainment or to provide a stronger signal. Thecombined receivers also provide, if they be sensitive to the same wavefrequency, for an easy method of securing an uninterrupted radio programshould one of the radios fail, as for example by the bumingput of atube.

A further object of this invention is to provide means whereby localreception can be received with a small consumption of power since only aportion of the associatedreceivers may be employed for this purpose.

My system of reception can be embodied in any set so long as the objectis to have a plural program receiver when desired and when a singleprogram is desired it will send a double output to 100 the particularspeaker desired at a tremendous volume. It is possible to receive onenearby station with one section of the receiving apparatus or with bothsections in parallel. That is, the

radio-frequency circuit, the detector circuit, and 105 frequency circuitof one section is coupled in 110 series with the radio-frequency circuitof the other section, and the detector circuits are connected inparallel, and the audio circuit of one section or of both sections canbe connected to the loud speaker or other reproducing means.

It is further to be observed that by means of my arrangement, selectionmay be made for short wave or long wave reception in sets arranged forboth short waves and long waves. Also, in a combined television andsound reception set, a switch may be used to connect either one for use.Different sets thus constructed may operate by power packs, separatebatteries, or in any other desired manner.

With the above and other objects in view as will be hereinafterapparent, the invention consists in general of certain novel details ofconstruction and combinations of parts hereinafter fully described,illustrated in the accompanying drawings and specifically claimed.

In the accompanying drawings like characters of reference indicate likeparts in the several views, and:

Figure 1 is a wiring diagram of the invention.

Figure 2 is a plan diagram of the invention.

Figure 3 is an outline front view of one typical arrangement of theapparatus.

Figure 4 is a view similar to Figure 3 but showing a second typical formof the invention.

Figure 5 is a view showing one means for coupling the two units.

Figure 6 is a face view of one of the connector terminals.

Figure 7 is a face view of the cooperating terminal.

The invention consists essentially of two receiving sets M and N, adouble throw multiple pole switch 0 and certain conductive connectionsbetween various parts. In connection with this apparatus an aerial P andloud speakers R and S belonging respectively to the sets M and N areutilized.

The parts in the two sets necessary to be described for an understandingof the invention will be indicated by like reference characters exceptthat where it is necessary to distinguish a part as belonging to aparticular unit it will have the reference character M or N affixedthereto according to which set it belongs.

As here shown each set is provided with a radio frequency stage, adetector and two stages of audio frequency amplification. However, thisparticular arrangement of parts may be varied at will and thearrangement shown in each set is to be understood as being merely a typeshowing of a standard arrangement or hook-up. Moreover, each set isshown as provided with the usual binding posts 10 which are indicated asmarked in the usual manner common in such sets. These sets will now bedescribed in sufficient detail to enable the invention to be understood.The antenna binding post A is connected by a wire 11 with the antennatransformer primary 12, the secondary 13 of this transformer beingconnected in the usual manner to the grid and filament of the radiofrequency stage tube 14, a variable condenser 15 being bridged acrossthis connection for tuning. At 16 is the radio frequency transformerconnected to the grid and filament of the detector tube 1'7, the plateof this tube being connected to the primary of the first stage audiofrequency transformer 18 the secondary of which is in turn connected tothe grid and filament of tube 19. The tube 19 has its plate connected tothe primary of the second stage audio frequency transformer 20 thesecondary of which is connected to the grid and filament of the tube 21,the plate of this tube being connected to the primary winding of theoutput transformer 22. The secondary winding of transformer 22 isconnected to the loud speaker binding posts (L. S.). A variablecondenser 23 is bridged across the grid and filament connections to thetube 17. So far the parts and connections are of standard type but thereis now a departure from the usual winding.

A switch 0 here shown as a six pole double throw switch has movablecontacts 24, 25, 26, 27, 28 and 29 on one side of which are fixedcontacts 30, 31, 32, 33, 34 and 35 and on the other side of which arefixed contacts 36, 37, 38, 39, 40 and 41. The contact 39 is a dead oridle contact. From the plate of tube M14 a wire 42 leads to contact 28and from the primary of transformer M16 a wire 43 leads to contact 29.Contacts 34 and 35 are connected by a conductor or wire 44. By thismeans movement of the switch to the left in Figure 1 connects the plateof tube 14 of set M through wire 42, contact 28, contact 34, wire 44,contact 35, contact 29 and wire 43 to the primary of transformer M16.The plate of tube N14 is connected to the primary of transformer N16 bythe usual wire 45. The antenna wire 46 extends from the antenna tocontact 2'7 and a branch wire 47 connects wire 46 with the antennabinding post A of set M. The contact 33 is connected by a wire 48 withthe antenna binding post A of set N. Thus when the switch is turned tothe left the antenna binding posts are connected in multiple to theantenna wire and the two sets may be tuned to different wavefrequencies. From the binding posts (L. S.) of set M run the wires 49and 50 which are connected respectively to the contacts 24 and 25; andthe loud speaker R is connected by wires 51 and 52 to the contacts 30and 31 respectively so that turning the switch to the left connects loudspeaker R to the output transformer M22.

The binding posts (L. S.) of set N are connected by wires 53 and 54 anda switch '70 when in its lower position to wires 55 and 56 leading fromcontacts 36 and 3'? to the loud speaker S so that turning the switch 0to the right connects the transformers 22 in multiple to the loudspeaker S so that this loud speaker, under these conditions receives thecombined output of both units. The battery side of the primary oftransformer M16 is connected by a wire 5'7 with contact 38 and contact26 is connected by a wire 58 with the ground side of the primary N12 ofthe input transformer of set N. Also the contact 40 is connected by awire 59 with the wire 48 and contact 41 is connected by a wire 60 withthe wire 45. Thus, when the switch is thrown to the right in Figure 1the antenna circuit is established from antenna P through wire 46, andwire 47 to pass through the primary M12. This affects the operation ofthe tube M14 which now acts as a first stage tube for radio frequencyamplification. From the plate of this tube a circuit is establishedthrough wire 42, contact 28, contact 40, wire 48, post A of set N, andthrough transformer primary N12 which thus affects the operation of tubeN14 which acts as a second stage tube for radio frequency amplification.Moreover, the primaries of transformers 16 are connected in multiplethrough contact 29 and wires 43 and 60.

Thus in position to the left the switch 0 conneG the parts for separateoperation of the units while the position of the switch to the rightconnects the radio frequency stages in series and also connects theaudio frequency stages in multiple to a single loud speaker.

These special connections may be led to socket plates 61 (Figs. 5 and 6)suitably fixed in any desired position on the cases of the sets andmulti-point plugs 62 (Figs. 5 and 7) may carry cables 63 by which theconnections may be carried to the switch 0.

The two instruments may be arranged in two cases 64 and 65 with a singlecontrol dial 66 for each as in Figure 3 or with multipoint dial 67 as inFigure 4. A battery case 68 may carry the switch which may be actuatedby a knob 69. The receiving sets and switch may be assembled in a unitto form an integral structure, as shown in Figs. 3 and 4. In fact, thereare many arrangements which may be used for housing the units and switchand I do not wish to confine the invention to any particular arrangementsince my invention is broader than any specific arrangement for casingand any specific arrangement for connecting the essentialinstrumentalities employed.

The auxiliary switch 70 is provided to supply the output to thereproducer at a high potential or at a low potential. The high potentialor up position of the switch will connect the secondaries of the audiotransformers of the receivers in series to the reproducer and the lowpotential or down position of the switch will connect the twosecondaries of the audio transformers of the receivers in parallel tothe reproducer.

There has thus been provided a simple and efficient device of the kinddescribed and for the purpose specified.

It is obvious that minor changes may be made in the form andconstruction of the invention without departing from the material spiritthereof. It is not, therefore. desired to confine the invention to theexact form herein shown and described, but it is desired to include allsuch as properly come within the scope claimed.

Having thus described the invention, what is claimed as new, is:

1. In wireless receiving apparatus, a pair of similar receiving unitseach having at least one stage of radio frequency amplification, adetector and at least one stage of audio frequency amplification; incombination with a pair of loud speakers, a switch,'and connectionsbetween said switch and units arranged in one position of the switch toconnect the units to respective loud speakers and to connect the radiofrequency stage of each unit to the detector of the same unit wherebythe sets may be independently operated and arranged in a second positionof the switch to connect both units to the same loud speaker and theradio frequency stages of both units in series to the detectors.

2. In wireless receiving apparatus, a pair of similar receiving unitseach having at least one stage of radio frequency amplification, adetector and at least one stage of audio frequency amplification; incombination with a switch and connections between the switch and unitsarranged in one position of the switch to permit Independent operationof the units and in a second posi tion of the switch to connect theunits with their radio frequency stages in series and their audiofrequency stages in multiple to a single loud speaker.

3. In wireless receiving apparatus, a pair of similar receiving unitseach having at least one stage of radio frequency amplification, adetector and at least one stage of audio frequency amplification; incombination with a pair of loud speakers, a switch, connections betweensaid switch and units arranged in one position of the switch to connectthe units to respective loud speakers and to connect the radio frequencystage of each unit to the detector of the same unit whereby the sets maybe independently operated and arranged in a second position of theswitch to connect both units to the same loud speaker and the radiofrequency stages of both units in series to the detectors, an antenna,and connections between said antenna, units and switch arranged in thefirst position of the switch to connect the radio frequency stages ofthe units in multiple to the antenna and in the second position of theswitch to connect the antenna in series to the series connected radiofrequency stages.

4. In wireless receiving apparatus, a pair of similar receiving unitseach having at least one stage of radio frequency amplification, adetector and at least one stage of audio frequency amplification; incombination with a switch and connections thereto arranged to permitindividual operation of the units in one position and cooperativeoperation in a second position, an antenna, and connections between saidantenna, units and switch arranged in the first position of the switchto connect the radio frequency stages of the units in multiple to theantenna and in the second position of the switch to connect the antennato the series connected radio frequency stages.

5. In wireless receiving apparatus, a pair of similar receiving unitseach having at least one stage of radio frequency amplification, adetector and at least one stage of audio frequency amplification; incombination with a switch and connections between the switch and unitsarranged 5 in one position of the switch to permit independent operationof the units and in a second position of the switch to connect the unitswith their radio frequency stages in series and their audio frequencystages in multiple to a single loud 120 speaker, an antenna, andconnections between said antenna, units and switch arranged in the firstposition of the switch to connect the radio frequency stages of theunits in multiple to the antenna and in the second position of theswitch 5 to connect the antenna to the series connected radio frequencystages.

6. In wireless receiving apparatus, a pair of receiving units eachhaving at least one stage of radio frequency amplification, a detectorand 130 at least one stage of audio frequency amplification; incombination with a pair of loud speakers,

a switch, connections between said switch and units arranged in oneposition of the switch to connect the units to respective loud speakersand 135 to connect the radio frequency stage of each unit to thedetector of the same unit whereby the sets may be independently operatedand arranged in a second position of the switch to connect both units tothe same loud speaker by connecting the radio frequency stages of bothunits in series to one of the detectors.

7. In a radio broadcast receiver, the combination of a pair of separateradio frequency amplifiers, a detector coupled to each of the radiofrequency amplifiers, and a separate translating device coupled to eachof the detectors, and means whereby the radio frequency amplifiers maybe combined to increase the signal strength in one of the translatingdevices.

8. A radio broadcasting receiving cabinet embracing a plural number ofunits, each unit having a detector and an audio frequency amplifierconnected thereto to give an independent loud output to a translator,and means to connect the output of the audio amplifiers in multiple orin series to a translator.

9. In a radio broadcast receiver, the combination of a pair of separatedetector devices, an audio frequency amplifier coupled to each of saiddetectors, a translating device connected to one of said amplifiers anda second translating-dc vice connected to the other of said amplfii'ers,

and means whereby the audio frequency amplifiers of said receiver may becombined to in-' crease the signal strength in one of the translatingdevices.

10. A radio receiving cabinet embracing a plural number of units, eachunit having a detector and an audio frequency amplifier. connectedthereto to give an independent output to a translator and means toconnect the output of the amplifiers in multiple series with atranslator.

11. In a combined plural radio receiver having a plural number ofdetecting circuits, an individual audio amplifying circuit for eachdetecting circuit, and means comprising a switch for connecting theoutputs of said audio amplifying circuits in series so as to give a highpotential output to a translator or in parallel to obtain a high currentoutput at a lower potential.

12. In a plural program radio receiving system, a collecting device, apair of radio receiving sets each comprising a radio-frequency amplifierand a detector, input and output terminals for each of said sets, anindividual radio-frequency output connection for one of saidradio-frequency amplifiers, a common multiple-point double-throw switch,and connections from the input and output terminals of each of said setsand from said radio-frequency output connection to the points of saidswitch, said switch being so wired that in one position of said switchthe radio-frequency amplifier of one set is connected in series throughsaid radio-frequency output connection to the radio-frequency input ofthe other set and to said collecting device and the output terminals ofsaid sets are connected in parallel, and in the other position of saidswitch the input terminals of said sets are connected in parallel tosaid collecting device.

13. In a plural program radio receiving system, a collecting device, apair of radio receiving sets each comprising a radio-frequency amplifierand a detector, input and output terminals for each of said sets, anindividual radio-frequency output connection for one of saidradio-frequency amplifiers, a common multiple-point doublethrow switch,a plurality of sets of multiple-contact separable plug and socketsmembers respectively for each of said receiving sets, one member of eachof said sets of plug and socket members being mounted on each of saidreceiving sets and having its contacts connected to said terminals ofsaid receiving set, and the other member of each of said sets of plugand socket members being connected to points of said switch, said switchbeing so wired that in one position thereof, the radio-frequency inputterminals of said sets are connected in parallel to said collectingdevice and in another position thereof the radio-frequency amplifiers ofsaid sets are connected in series through said radio-frequency outputconnection to said collecting device.

14. In a binary radio receiving system, a collecting device, a firstradio receiving set, a companion radio receiving set, each of said setscomprising a radio-frequency amplifier and a detector, input and outputterminals for each of said sets, individual separable multiple-contactplug-in connector means mounted respectively on said sets and havingcontacts connected to the circuits of said sets respectively, and acommon .multiple-point double-throw switch unit having its pointsrespectively connected to said plug-in connector means and being sowired that in one position of said switch unit the radio-frequency inputterminals of said sets are connected in parallel to said collectingdevice and the output terminals of said sets are separate, and inanother position of said switch unit said radiofrequency amplifiers areconnected in series to said collecting device and the output terminalsof said sets are connected in parallel, whereby said first set andsaid-companion set can be operated together in desired manner byplugging in said connector means in said sets without changingv theinternal wiring thereof or removing any tubes therefrom. p

15. In a plural program radio receiving system, a collecting device, apair .of radio receiving sets each comprising a radio-frequencyamplifier and a detector, input and output terminals for each of saidsets, an individual radio-requency output connection for one of saidradio-frequency amplifiers, and adjustable means for alternativelyconnecting the radio-frequency input terminals of said sets in parallelto said collecting device or connecting the radio-frequency amplifiersof said sets in seriesto said collecting device through saidradio-frequency output connection.

16. In a plural program radio receiving system, a collecting device, apair of radio receiving sets each comprising a radio-frequency amplifierand a detector, input and outputterminals for each of said .sets, anindividual radio-frequency output connection for one of saidradio-frequency'amplifier's, adjustable. means for alternativelyconnecting' the radio-frequency input terminals of said sets in parallelto said collecting device or connecting the radio-frequency amplifiersof said sets in series to said collecting device through saidradio-frequency output connection, and individual two-piece separablemultiple-contactplug-in connectors for each of said sets connected fromsaid means to said terminals and said radio-frequency outputconnection,,one pieceof each of said connectors being mounted on each ofsaid sets respectively.

17. In a plural program radio receiving system, a collecting device, apair of radio receiving sets each comprising a radio-frequency amplifierand a detector unit, input and output terminals for each of said'sets, acommon multiple-point double-throw switch, and connections to the pointsof said switch from the input and output terminals ofeach of said' setsand from the output of each radio-frequency amplifier and from the inputof each detector unit, said switch being so wired that in one positionof said switch the input terminals of said sets are connected inparallel to said collecting device and said sets operate independently,and in the other position of said switch the detector units of said setshave both their inputs and outputs connected respectively in paralleland the radio-frequency amplifiers of said sets are connected in seriesbetween said collecting device and the inputs of said detector units.

18. In a plural program radio receiving system, a collecting device, apair of radio receiving sets each comprising a radio-frequencyamplifier, a detector, and an audio-frequency amplifier, input andoutput terminals for each of said sets, a common multiple-pointdouble-throw switch, andconnections to the points of said switch fromthe input and output terminals of each of said sets and from the outputof each radio-frequency amplifier and from the input of each detector,said switch being so wired that in one position of said switch the inputterminals of said sets are connected in parallel to said collectingdevice and said sets operate independently, and in the other position ofsaid switch the inputs of said detectors and the outputs of saidaudio-frequency amplifiers are respectively connected in parallel andthe radio-frequency amplifiers of said sets are connected in seriesbetween said collecting device and the inputs of said detectors.

19. In a plural program radio receiving system, a. collecting device, apair of radio receiving sets each comprising a radio-frequency amplifierand a detector unit, input and output terminals for each of said sets, acommon multiple-point double-throw switch, individual two-pieceseparable plug-in connectors for each of said sets,

one piece of each of said connectors being mounted on each of said setsrespectively and having its contact blades connected to the terminals ofsaid sets respectively, and connections to the points of said switchthrough said connectors respectively from the input and output terminalsof each of said sets and from the output of each radio-frequencyamplifier and from the input of each detector unit, said switch being sowired that in one position of said switch the input terminals of saidsets are connected in parallel to said collecting device and said setsoperate independently, and in the other position of said switch theinputs and outputs of said detector units are respectively connected inparallel and the radio-frequency amplifiers of said sets are connectedin series between said collecting device and the inputs of said detectorunits.

MORRIS W. ASKIN.

